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What are the main causes of permanent magnet demagnetization?
By demagnetization is meant that the magnetism of the magnet is reduced or completely disappeared, and the permanent magnet operates based on the arrangement of micro-regions within the alloy material, these small regions are called domains, and each domain is like a micro-magnet in a larger whole. Part of the process of developing permanent magnets involves placing a high-strength magnetic material-usually alnico, strontium iron (known as ceramic or ferrite), neodymium iron boron, or samarium cobalt-in a strong magnetic field. In the process of magnetizing a material, individual magnetic domains, which generally point in all directions, will align with the direction of the magnetic field. When almost all the magnetic domains are aligned with the original magnetic field, the material becomes a permanent magnet. When you demagnetize a magnet, its domains are no longer perfectly aligned. It is the alignment of these domains that provides the magnetic properties of the material. When the magnetic field (magnetic domain alignment) is broken, the magnet has been demagnetized.
2024-05-11
Is it difficult to re-magnetize?
Depending on the cause of the demagnetization and the duration of the condition, it is possible to repurpose the magnetic material and restore the lost magnetism. One method for restoring the permanent magnet is to use a solenoid. When current is activated through the coiled wire of the solenoid, it may be sufficient to restore the magnetic field of the magnet. The demagnetization can adversely affect the function of the magnet and the use of the magnet as a component. Therefore, it is very important to identify and design magnetic components to avoid physical conditions that may demagnetize.
2024-05-11
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